<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator=">">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card class="box-card">
            <!-- 头部警告区域 -->
            <el-alert title="注意：只允许为第三级分类设置相关参数" show-icon type="warning" :closable="false"/>
            
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类:</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader style="margin-left:15px" v-model="selectedCateKeys" 
                    :options="catelist" :props="cascaderProps" clearable
                    @change="handleChange" 
                    />
                </el-col>
            </el-row>

            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-change="handleTabClick">
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="small" :disabled="isBtnDisabled" 
                    @click="addDialogVisible=true" >添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" 
                                closable
                                @close="handleClose(i, scope.row)"
                                >
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    v-if="scope.row.inputVisible"
                                    ref="saveTagInput"
                                    v-model="scope.row.inputValue"
                                    class="ml-1 w-20"
                                    size="small"
                                    @keyup.enter="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                />
                                <el-button v-else class="button-new-tag ml-1" size="small" @click="showInput(scope.row)">
                                    + New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button type="primary" size="small" @click="showEditDialog(scope.row.attr_id)"><el-icon><Edit /></el-icon>编辑</el-button>
                                <el-button type="danger" size="small" @click="removeParams(scope.row.attr_id)"><el-icon><Delete /></el-icon>删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>


                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="small" :disabled="isBtnDisabled"
                    @click="addDialogVisible=true" >添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" 
                                closable
                                @close="handleClose(i, scope.row)"
                                >
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    v-if="scope.row.inputVisible"
                                    ref="saveTagInput"
                                    v-model="scope.row.inputValue"
                                    class="ml-1 w-20"
                                    size="small"
                                    @keyup.enter="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                />
                                <el-button v-else class="button-new-tag ml-1" size="small" @click="showInput(scope.row)">
                                    + New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button type="primary" size="small" @click="showEditDialog(scope.row.attr_id)"><el-icon><Edit /></el-icon>编辑</el-button>
                                <el-button type="danger" size="small" @click="removeParams(scope.row.attr_id)"><el-icon><Delete /></el-icon>删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>

        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
        v-model="addDialogVisible"
        :title="'添加' + titleText"
        width="50%"
        @close="addDialogClosed"
        >

        <el-form
        ref="addFormRef"
        :model="addForm"
        :rules="addFormRules"
        label-width="100px"
        >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name" />
            </el-form-item>
        </el-form>
 
        <template #footer>
        <span class="dialog-footer">
            <el-button @click="addDialogVisible = false">
            取消
            </el-button>
            <el-button type="primary" @click="addParams">
            确定
            </el-button>
        </span>
        </template>
    </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog
        v-model="editDialogVisible"
        :title="'修改' + titleText"
        width="50%"
        @close="editDialogClosed"
        >

        <el-form
        ref="editFormRef"
        :model="editForm"
        :rules="editFormRules"
        label-width="100px"
        >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name" />
            </el-form-item>
        </el-form>
 
        <template #footer>
        <span class="dialog-footer">
            <el-button @click="editDialogVisible = false">
            取消
            </el-button>
            <el-button type="primary" @click="editParams">
            确定
            </el-button>
        </span>
        </template>
    </el-dialog>

    </div>
</template>

<script>
import { ElMessage, ElMessageBox } from 'element-plus'
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级联选择器配置对象
            cascaderProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover',
                checkStrictly: true,
            },
            // 级联选择器双向绑定的数据
            selectedCateKeys: [],
            // 被激活的页签名称
            activeName: 'many',
            // 动态 静态 数据
            manyTableData: [],
            onlyTableData: [],
            // 控制添加对话框显示
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 添加表单的验证规则对象
            addFormRules: {
                attr_name: [{
                    required: true,
                    message: '请输入参数名称',
                    trigger: 'blur'
                }]
            },

            // 控制修改对话框的显示与隐藏
            editDialogVisible: false,

            // 修改的表单的数据对象
            editForm: {},
            // 修改表单的验证规则对象
            editFormRules: {
                attr_name: [{
                    required: true, message: '请输入数据名称', trigger: 'blur'
                }]
            },

            // 控制按钮及文本框的切换显示
            inputVisible: false,

            // 文本框内容
            inputValue: ''
        }
    },

    created() {
        this.getCateList()
    },

    methods: {
        // 获取所有商品分类列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories')

            if (res.meta.status !== 200) return this.$message.error('获取商品分类失败！')

            this.catelist = res.data
        },

        // 获取参数的列表数据
        async getParamsData() {
            // 只允许三级被选中
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            console.log(this.selectedCateKeys)
            console.log(this.activeName)
            // 根据所选分类id和当前所处的面板获取对应的参数
            const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes`, {
                params: { sel: this.activeName }
            })

            if (res.meta.status !== 200) return this.$message.error('获取商品分类失败！')

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []  
                // 控制文本框的显示和隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputValue = ''              
            });
            console.log(res.data)

            if (this.activeName === 'many') {
                this.manyTableData = res.data
            } else {
                this.onlyTableData = res.data
            }
        },


        // 级联选择器变化触发
        handleChange() {
            this.activeName = 'many'
            this.getParamsData()
        },

        // tab 页签点击事件的处理函数
        handleTabClick() {
            console.log(this.activeName + 'hello')
            this.getParamsData()
            if (this.activeName === 'many') console.log('1')
            else console.log('2')
        },

        // 监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },

        // 点击按钮，添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })

                if (res.meta.status !== 201) {
                    return this.$message.error('添加参数失败')
                }

                this.$message.success('添加参数成功')
                this.addDialogVisible = false
                this.getParamsData()
            })

        },

        // 点击按钮 展示修改的对话框
        async showEditDialog(attr_id) {
            // 查询当前参数的信息
            const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes/${attr_id}`,
                { params: { attr_sel: this.activeName } }
            )

            if (res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },

        // 重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },

        // 点击按钮 修改数据信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })

                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数失败')
                }

                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },


        // 根据id删除对应参数项
        async removeParams(attr_id) {
            await ElMessageBox.confirm(
                '将永久删除，是否继续',
                '警告',
                {
                    confirmButtonText: '确认',
                    cancelButtonText: '取消',
                    type: 'warning',
                }).then(async () => {

                    ElMessage({
                        type: 'success',
                        message: '删除成功',
                    })
                    await this.$http.delete(
                        `categories/${this.cateId}/attributes/${attr_id}`
                    )
                })
                .catch(() => {
                    ElMessage({
                        type: 'info',
                        message: '取消删除',
                    })
                })
                this.getParamsData()
        },

        // 文本框失焦，或点enter都触发
        async handleInputConfirm(row) {
            if (row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false   
                return
            }

            // 如果没有return，则证明输入的内容，需要做后续的处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false

            // 需要发起请求，保存这次操作
            this.saveAttrVals(row)
        },

        // 将对attr_vals的操作保存到数据库
        async saveAttrVals(row) {
            // 需要发起请求，保存这次操作
            const { data: res } = await this.$http.put(
                `categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(' ')
                }
            )

            if (res.meta.status !== 200) {
                return this.$message.error('修改参数项失败')
            }

            this.$message.success('修改参数项成功')
        },

        // 点击按钮，展示文本输入框
        showInput(row) {
            row.inputVisible = true

            // 让文本框自动获得焦点
            this.$nextTick(() => {
                saveTagInput.value.input.focus()
                console.log('获得焦点')
            })
        },

        // 删除对应的参数可选项
        handleClose(i, row) {
            // splice删除 
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
    },

    computed: {
        // 按钮需要被禁用返回true 反之
        isBtnDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },

        // 当前选中的三级分类的id
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },

        titleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            } else {
                return '静态属性'
            }
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px;
}

.el-tag{
    margin: 15px;
}

.w-20{
    width: 120px;
}

.ml-1{
    margin-left: 15px;
}
</style>